ChenXi created HDDS-8421:
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Summary: Reduce DN IO times when writeChunk (FilePerBlockStrategy)
Key: HDDS-8421
URL: https://issues.apache.org/jira/browse/HDDS-8421
Project: Apache Ozone
Issue Type: Improvement
Components: Ozone Datanode
Reporter: ChenXi
Assignee: ChenXi
In the FilePerBlockStrategy#writeChunk will generate twice IO process.
- The first is to check whether the write operation is an overwrite, will check
whether the chunk file is exist (ChunkUtils#verifyChunkFileExists).
- The second is write Chunk, will open file and write file.
Those two IO operation can merge to once. just need to check whether is
overwrite after open file and before write Chunk
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